中国电力2025，Vol.58Issue(3)：20-30,11.DOI:10.11930/j.issn.1004-9649.202402044
基于有源和无源阻尼协同控制的光伏直流升压汇集系统谐振抑制
Resonance Suppression of Photovoltaic DC Boost Collection System Based on Active and Passive Damping Cooperative Control
摘要
Abstract
In a photovoltaic DC collection system,the impedance matching between the LC circuit and switching circuit in the DC/DC converter is easy to generate resonance,which leads to the system stability deterioration or even collapse.In order to solve the resonant problem of the converter due to impedance matching,the active and passive damping cooperative control is proposed to eliminate the resonance.Firstly,the small-signal impedance model of the converter under different operating conditions is established.Secondly,the impedance ratio criterion is used to analyze the stability differences of the system,and the influence of different virtual resistance values on the system stability is discussed.Finally,by using the ratio of the equivalent impedance amplitude between the angular frequency point at which the resonance peak is generated and its neighboring normal angular frequency point limited between[0.95,1.15],the closed-loop output impedance amplitude of the converter under MPPT control with the value of the damping resistor is obtained to be improved by about 1.5 times.The results show that compared with only active or passive damping control,the proposed cooperative control strategy increases the amplitude at resonance generation from-15dB to 40.5dB,which is about 4 times,and the system has large amplitude margin and phase margin,which effectively improve the stability of the system.关键词
光伏发电/直流升压汇集/小信号阻抗建模/有源和无源阻尼/谐振抑制/稳定性分析Key words
photovoltaic power/DC boost collection/small-signal impedance model/active and passive damping/resonance suppression/stability analysis引用本文复制引用
潘鹏程,韩文舜,郭雪丽..基于有源和无源阻尼协同控制的光伏直流升压汇集系统谐振抑制[J].中国电力,2025,58(3):20-30,11.基金项目
国家水运安全工程技术研究中心开放基金资助项目(B2022002). This work is supported by Open Fund of the National Engineering Research Center for Water Transport Safety(No.B2022002). （B2022002）
